Madonna's Mickey success

The '4 Minutes' singer doesn't believe she would have made the same album if producer Pharrell hadn't worn his unusual footwear.

She said: "Pharrell had these lucky charms, including his Mickey Mouse slippers. He said he couldn't work without them!"

The 49-year-old singer also said she was unsure whether her '4 Minutes' collaborator Justin Timberlake would appear with her at Radio 1's Big Weekend in Kent, England, on Saturday (10.05.08) but has prepared either way.

She added to BBC Radio 1: "I don't know if he is going to be there or not. We will see! But if he isn't we will have a video projection and will change around the choreography and everything."

Other performers at the event in Maidstone include The Kooks, Duffy, Adele and Usher.